Merge tag 'stable/for-linus-fixes-3.3-rc3' of git://git.kernel.org/pub/scm/linux...
[linux-2.6.git] / drivers / power / lp8727_charger.c
1 /*
2  * Driver for LP8727 Micro/Mini USB IC with intergrated charger
3  *
4  *                      Copyright (C) 2011 National Semiconductor
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/i2c.h>
16 #include <linux/power_supply.h>
17 #include <linux/lp8727.h>
18
19 #define DEBOUNCE_MSEC   270
20
21 /* Registers */
22 #define CTRL1           0x1
23 #define CTRL2           0x2
24 #define SWCTRL          0x3
25 #define INT1            0x4
26 #define INT2            0x5
27 #define STATUS1         0x6
28 #define STATUS2         0x7
29 #define CHGCTRL2        0x9
30
31 /* CTRL1 register */
32 #define CP_EN           (1 << 0)
33 #define ADC_EN          (1 << 1)
34 #define ID200_EN        (1 << 4)
35
36 /* CTRL2 register */
37 #define CHGDET_EN       (1 << 1)
38 #define INT_EN          (1 << 6)
39
40 /* SWCTRL register */
41 #define SW_DM1_DM       (0x0 << 0)
42 #define SW_DM1_U1       (0x1 << 0)
43 #define SW_DM1_HiZ      (0x7 << 0)
44 #define SW_DP2_DP       (0x0 << 3)
45 #define SW_DP2_U2       (0x1 << 3)
46 #define SW_DP2_HiZ      (0x7 << 3)
47
48 /* INT1 register */
49 #define IDNO            (0xF << 0)
50 #define VBUS            (1 << 4)
51
52 /* STATUS1 register */
53 #define CHGSTAT         (3 << 4)
54 #define CHPORT          (1 << 6)
55 #define DCPORT          (1 << 7)
56
57 /* STATUS2 register */
58 #define TEMP_STAT       (3 << 5)
59
60 enum lp8727_dev_id {
61         ID_NONE,
62         ID_TA,
63         ID_DEDICATED_CHG,
64         ID_USB_CHG,
65         ID_USB_DS,
66         ID_MAX,
67 };
68
69 enum lp8727_chg_stat {
70         PRECHG,
71         CC,
72         CV,
73         EOC,
74 };
75
76 struct lp8727_psy {
77         struct power_supply ac;
78         struct power_supply usb;
79         struct power_supply batt;
80 };
81
82 struct lp8727_chg {
83         struct device *dev;
84         struct i2c_client *client;
85         struct mutex xfer_lock;
86         struct delayed_work work;
87         struct workqueue_struct *irqthread;
88         struct lp8727_platform_data *pdata;
89         struct lp8727_psy *psy;
90         struct lp8727_chg_param *chg_parm;
91         enum lp8727_dev_id devid;
92 };
93
94 static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
95 {
96         s32 ret;
97
98         mutex_lock(&pchg->xfer_lock);
99         ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
100         mutex_unlock(&pchg->xfer_lock);
101
102         return (ret != len) ? -EIO : 0;
103 }
104
105 static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
106 {
107         s32 ret;
108
109         mutex_lock(&pchg->xfer_lock);
110         ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
111         mutex_unlock(&pchg->xfer_lock);
112
113         return ret;
114 }
115
116 static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
117                                        u8 *data)
118 {
119         return lp8727_i2c_read(pchg, reg, data, 1);
120 }
121
122 static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
123                                         u8 *data)
124 {
125         return lp8727_i2c_write(pchg, reg, data, 1);
126 }
127
128 static int lp8727_is_charger_attached(const char *name, int id)
129 {
130         if (name) {
131                 if (!strcmp(name, "ac"))
132                         return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
133                 else if (!strcmp(name, "usb"))
134                         return (id == ID_USB_CHG) ? 1 : 0;
135         }
136
137         return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
138 }
139
140 static void lp8727_init_device(struct lp8727_chg *pchg)
141 {
142         u8 val;
143
144         val = ID200_EN | ADC_EN | CP_EN;
145         if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
146                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
147
148         val = INT_EN | CHGDET_EN;
149         if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
150                 dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
151 }
152
153 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
154 {
155         u8 val;
156         lp8727_i2c_read_byte(pchg, STATUS1, &val);
157         return (val & DCPORT);
158 }
159
160 static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
161 {
162         u8 val;
163         lp8727_i2c_read_byte(pchg, STATUS1, &val);
164         return (val & CHPORT);
165 }
166
167 static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
168 {
169         u8 val = sw;
170         lp8727_i2c_write_byte(pchg, SWCTRL, &val);
171 }
172
173 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
174 {
175         u8 devid = ID_NONE;
176         u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
177
178         switch (id) {
179         case 0x5:
180                 devid = ID_TA;
181                 pchg->chg_parm = &pchg->pdata->ac;
182                 break;
183         case 0xB:
184                 if (lp8727_is_dedicated_charger(pchg)) {
185                         pchg->chg_parm = &pchg->pdata->ac;
186                         devid = ID_DEDICATED_CHG;
187                 } else if (lp8727_is_usb_charger(pchg)) {
188                         pchg->chg_parm = &pchg->pdata->usb;
189                         devid = ID_USB_CHG;
190                         swctrl = SW_DM1_DM | SW_DP2_DP;
191                 } else if (vbusin) {
192                         devid = ID_USB_DS;
193                         swctrl = SW_DM1_DM | SW_DP2_DP;
194                 }
195                 break;
196         default:
197                 devid = ID_NONE;
198                 pchg->chg_parm = NULL;
199                 break;
200         }
201
202         pchg->devid = devid;
203         lp8727_ctrl_switch(pchg, swctrl);
204 }
205
206 static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
207 {
208         u8 val;
209
210         lp8727_i2c_read_byte(pchg, CTRL2, &val);
211         val |= CHGDET_EN;
212         lp8727_i2c_write_byte(pchg, CTRL2, &val);
213 }
214
215 static void lp8727_delayed_func(struct work_struct *_work)
216 {
217         u8 intstat[2], idno, vbus;
218         struct lp8727_chg *pchg =
219             container_of(_work, struct lp8727_chg, work.work);
220
221         if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
222                 dev_err(pchg->dev, "can not read INT registers\n");
223                 return;
224         }
225
226         idno = intstat[0] & IDNO;
227         vbus = intstat[0] & VBUS;
228
229         lp8727_id_detection(pchg, idno, vbus);
230         lp8727_enable_chgdet(pchg);
231
232         power_supply_changed(&pchg->psy->ac);
233         power_supply_changed(&pchg->psy->usb);
234         power_supply_changed(&pchg->psy->batt);
235 }
236
237 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
238 {
239         struct lp8727_chg *pchg = ptr;
240         unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
241
242         queue_delayed_work(pchg->irqthread, &pchg->work, delay);
243
244         return IRQ_HANDLED;
245 }
246
247 static void lp8727_intr_config(struct lp8727_chg *pchg)
248 {
249         INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
250
251         pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
252         if (!pchg->irqthread)
253                 dev_err(pchg->dev, "can not create thread for lp8727\n");
254
255         if (request_threaded_irq(pchg->client->irq,
256                                  NULL,
257                                  lp8727_isr_func,
258                                  IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
259                 dev_err(pchg->dev, "lp8727 irq can not be registered\n");
260         }
261 }
262
263 static enum power_supply_property lp8727_charger_prop[] = {
264         POWER_SUPPLY_PROP_ONLINE,
265 };
266
267 static enum power_supply_property lp8727_battery_prop[] = {
268         POWER_SUPPLY_PROP_STATUS,
269         POWER_SUPPLY_PROP_HEALTH,
270         POWER_SUPPLY_PROP_PRESENT,
271         POWER_SUPPLY_PROP_VOLTAGE_NOW,
272         POWER_SUPPLY_PROP_CAPACITY,
273         POWER_SUPPLY_PROP_TEMP,
274 };
275
276 static char *battery_supplied_to[] = {
277         "main_batt",
278 };
279
280 static int lp8727_charger_get_property(struct power_supply *psy,
281                                        enum power_supply_property psp,
282                                        union power_supply_propval *val)
283 {
284         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
285
286         if (psp == POWER_SUPPLY_PROP_ONLINE)
287                 val->intval = lp8727_is_charger_attached(psy->name,
288                                                          pchg->devid);
289
290         return 0;
291 }
292
293 static int lp8727_battery_get_property(struct power_supply *psy,
294                                        enum power_supply_property psp,
295                                        union power_supply_propval *val)
296 {
297         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
298         u8 read;
299
300         switch (psp) {
301         case POWER_SUPPLY_PROP_STATUS:
302                 if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
303                         lp8727_i2c_read_byte(pchg, STATUS1, &read);
304                         if (((read & CHGSTAT) >> 4) == EOC)
305                                 val->intval = POWER_SUPPLY_STATUS_FULL;
306                         else
307                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
308                 } else {
309                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
310                 }
311                 break;
312         case POWER_SUPPLY_PROP_HEALTH:
313                 lp8727_i2c_read_byte(pchg, STATUS2, &read);
314                 read = (read & TEMP_STAT) >> 5;
315                 if (read >= 0x1 && read <= 0x3)
316                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
317                 else
318                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
319                 break;
320         case POWER_SUPPLY_PROP_PRESENT:
321                 if (pchg->pdata->get_batt_present)
322                         val->intval = pchg->pdata->get_batt_present();
323                 break;
324         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
325                 if (pchg->pdata->get_batt_level)
326                         val->intval = pchg->pdata->get_batt_level();
327                 break;
328         case POWER_SUPPLY_PROP_CAPACITY:
329                 if (pchg->pdata->get_batt_capacity)
330                         val->intval = pchg->pdata->get_batt_capacity();
331                 break;
332         case POWER_SUPPLY_PROP_TEMP:
333                 if (pchg->pdata->get_batt_temp)
334                         val->intval = pchg->pdata->get_batt_temp();
335                 break;
336         default:
337                 break;
338         }
339
340         return 0;
341 }
342
343 static void lp8727_charger_changed(struct power_supply *psy)
344 {
345         struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
346         u8 val;
347         u8 eoc_level, ichg;
348
349         if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
350                 if (pchg->chg_parm) {
351                         eoc_level = pchg->chg_parm->eoc_level;
352                         ichg = pchg->chg_parm->ichg;
353                         val = (ichg << 4) | eoc_level;
354                         lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
355                 }
356         }
357 }
358
359 static int lp8727_register_psy(struct lp8727_chg *pchg)
360 {
361         struct lp8727_psy *psy;
362
363         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
364         if (!psy)
365                 goto err_mem;
366
367         pchg->psy = psy;
368
369         psy->ac.name = "ac";
370         psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
371         psy->ac.properties = lp8727_charger_prop;
372         psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
373         psy->ac.get_property = lp8727_charger_get_property;
374         psy->ac.supplied_to = battery_supplied_to;
375         psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
376
377         if (power_supply_register(pchg->dev, &psy->ac))
378                 goto err_psy;
379
380         psy->usb.name = "usb";
381         psy->usb.type = POWER_SUPPLY_TYPE_USB;
382         psy->usb.properties = lp8727_charger_prop;
383         psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
384         psy->usb.get_property = lp8727_charger_get_property;
385         psy->usb.supplied_to = battery_supplied_to;
386         psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
387
388         if (power_supply_register(pchg->dev, &psy->usb))
389                 goto err_psy;
390
391         psy->batt.name = "main_batt";
392         psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
393         psy->batt.properties = lp8727_battery_prop;
394         psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
395         psy->batt.get_property = lp8727_battery_get_property;
396         psy->batt.external_power_changed = lp8727_charger_changed;
397
398         if (power_supply_register(pchg->dev, &psy->batt))
399                 goto err_psy;
400
401         return 0;
402
403 err_mem:
404         return -ENOMEM;
405 err_psy:
406         kfree(psy);
407         return -EPERM;
408 }
409
410 static void lp8727_unregister_psy(struct lp8727_chg *pchg)
411 {
412         struct lp8727_psy *psy = pchg->psy;
413
414         if (!psy)
415                 return;
416
417         power_supply_unregister(&psy->ac);
418         power_supply_unregister(&psy->usb);
419         power_supply_unregister(&psy->batt);
420         kfree(psy);
421 }
422
423 static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
424 {
425         struct lp8727_chg *pchg;
426         int ret;
427
428         if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
429                 return -EIO;
430
431         pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
432         if (!pchg)
433                 return -ENOMEM;
434
435         pchg->client = cl;
436         pchg->dev = &cl->dev;
437         pchg->pdata = cl->dev.platform_data;
438         i2c_set_clientdata(cl, pchg);
439
440         mutex_init(&pchg->xfer_lock);
441
442         lp8727_init_device(pchg);
443         lp8727_intr_config(pchg);
444
445         ret = lp8727_register_psy(pchg);
446         if (ret)
447                 dev_err(pchg->dev,
448                         "can not register power supplies. err=%d", ret);
449
450         return 0;
451 }
452
453 static int __devexit lp8727_remove(struct i2c_client *cl)
454 {
455         struct lp8727_chg *pchg = i2c_get_clientdata(cl);
456
457         lp8727_unregister_psy(pchg);
458         free_irq(pchg->client->irq, pchg);
459         flush_workqueue(pchg->irqthread);
460         destroy_workqueue(pchg->irqthread);
461         kfree(pchg);
462         return 0;
463 }
464
465 static const struct i2c_device_id lp8727_ids[] = {
466         {"lp8727", 0},
467         { }
468 };
469
470 static struct i2c_driver lp8727_driver = {
471         .driver = {
472                    .name = "lp8727",
473                    },
474         .probe = lp8727_probe,
475         .remove = __devexit_p(lp8727_remove),
476         .id_table = lp8727_ids,
477 };
478
479 static int __init lp8727_init(void)
480 {
481         return i2c_add_driver(&lp8727_driver);
482 }
483
484 static void __exit lp8727_exit(void)
485 {
486         i2c_del_driver(&lp8727_driver);
487 }
488
489 module_init(lp8727_init);
490 module_exit(lp8727_exit);
491
492 MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
493 MODULE_AUTHOR
494     ("Woogyom Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
495 MODULE_LICENSE("GPL");